But, wot I have done in the past and it has been quite successful is to get the dyed shrimp/prawn (brightest red ones) that the salmon river anglers use and pull off the head and tail and use a bit to tip off lug, fish etc. I have found that fish attracted to colour can really go for it. It is a bit like the glow grub suggestion but you are using a bit of prawn.
There is then the option of dyeing the things a whole host of colours yourself - red, blue, green etc and adding colour and scent at the same time.


sk